CN109935439B

CN109935439B - Coil component

Info

Publication number: CN109935439B
Application number: CN201811516332.XA
Authority: CN
Inventors: 宫本昌史; 山本滋人; 山口健太郎
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2015-10-05
Filing date: 2016-06-20
Publication date: 2021-02-09
Anticipated expiration: 2036-06-20
Also published as: WO2017061143A1; JPWO2017061143A1; US11087918B2; US11232898B2; CN109935439A; CN107430923B; DE112016001049T5; DE112016001049B4; TWI604479B; TW201714189A; CN107430923A; JP6327397B2; US20180096782A1; US20190131061A1

Abstract

In a winding-type common mode choke coil, which is an example of a coil component, a disadvantage that a mode conversion characteristic is increased due to an influence of a stray capacitance is eliminated. In the winding core (45), a 0.5 turn region A in which the 1 st thread (43) of the 1 st layer and the 2 nd thread (44) of the 2 nd layer are shifted by 0.5 turn and a 1.5 turn region B in which the 1.5 turn is shifted in the opposite direction are distributed in the axial direction. In the 0.5 turn offset region a, a diagonal capacitance is generated that is numerically-1 or +1 for every 1 turn, and in the 1.5 turn offset region B, a diagonal capacitance is generated that is numerically-3 or-3 for every 1 turn. Here, the sum of the number of turns of the 2 nd wire (44) located in the region A with 0.5 turns is set to be 2 times or more and 5 times or less of the sum of the number of turns of the 2 nd wire located in the region B with 1.5 turns, so that the skew capacitance is balanced in the entire 1 st and 2 nd wires, and the influence of the stray capacitance is reduced.

Description

Coil component

The present application is a divisional application of an application having an application number of 201680018099.5 and an invention name of "coil component" filed by 25.9.2017 to the national patent office of china.

Technical Field

The present invention relates to a coil component, and more particularly, to an improvement in a winding method of a winding type coil component having a structure in which 2 wires are wound around a winding core.

Background

A typical example of the coil component according to the present invention is a common mode choke coil.

A common mode choke coil, which is of interest in the present invention, is described in, for example, japanese patent No. 4789076 (patent document 1). Fig. 9 shows an external appearance of a common mode choke coil 41 having a configuration substantially similar to that described in patent document 1.

As shown in fig. 9, the common mode choke coil 41 includes: a core 42, and a1 st wire (wire)43 and a2 nd wire 44 constituting inductors, respectively. The core 42 is made of an electrically insulating material, more specifically, aluminum as a dielectric material, Ni — Zn ferrite as a magnetic material, or a resin. The core 42 has a cross-sectional quadrangular shape as a whole. The

wires

43 and 44 are made of, for example, copper wires covered with insulation.

The core 42 has a winding core portion 45 and a1 st flange portion 46 and a2 nd flange portion 47 provided at each end of the winding core portion 45. The 1 st wire 43 and the 2 nd wire 44 are wound in a spiral shape with substantially the same number of turns from the 1 st end portion on the 1 st flange portion 46 side toward the 2 nd end portion on the 2 nd flange portion 47 side on the winding core portion 45.

The 1 st flange 46 is provided with 1 st and 2 nd

terminal electrodes

48 and 49, and the 2 nd flange 47 is provided with the 3 rd and 4

th terminal electrodes

50 and 51. The terminal electrodes 48 to 51 are formed by, for example, sintering conductive paste, plating conductive metal, or the like. As is clear from the positions of the terminal electrodes 48 to 51, fig. 9 shows the common mode choke coil 41 in a posture in which the mounting surface facing the mounting substrate side of the common mode choke coil 41 faces upward.

The 1 st wire 43 has ends connected to the 1 st and 3

rd terminal electrodes

48 and 50, and the 2 nd wire 44 has ends connected to the 2 nd and 4

th terminal electrodes

49 and 51. These connections can be made, for example, by thermocompression bonding.

The common mode choke coil 41 having the above-described configuration is provided with an equivalent circuit as shown in fig. 10. In fig. 10, elements corresponding to those shown in fig. 9 are assigned the same reference numerals.

Referring to fig. 10, the common mode choke coil 41 includes: a1 st inductor 52 formed of the 1 st line 43 connected between the 1 st and 3

rd terminal electrodes

48 and 50, and a2 nd inductor 53 formed of the 2 nd line 44 connected between the 2 nd and 4 th

terminal electrodes

49 and 51. These 1

st inductor

52 and 2 nd inductor 53 are magnetically coupled to each other.

Although not shown explicitly in fig. 9, the 1 st wire 43 is wound in a state of constituting the 1 st layer in contact with the circumferential surface of the winding core 45, and the 2 nd wire 44 is wound in a state of constituting the 2 nd layer outside the 1 st layer with a part of its cross section fitted into a recess formed between adjacent turns (turns) of the 1 st wire 43.

The common mode choke coil 41 further includes a top plate 54. The top plate 54 is made of, for example, aluminum as a non-magnetic material, Ni — Zn ferrite as a magnetic material, or resin, as in the case of the core 42. When the core 42 and the top plate 54 are made of a magnetic material, the top plate 54 is provided so as to connect the 1 st flange portion 46 and the 2 nd flange portion 47, and the core 42 and the top plate 54 are engaged with each other to form a closed magnetic circuit.

Patent document 1: japanese patent No. 4789076

In the common mode choke coil 41, when the frequency of the signal input thereto becomes high, the mode conversion characteristic, which is the ratio of the differential signal component input to be converted into the common mode noise and output, may be large.

The same problem is not limited to the common mode choke coil, but is also encountered in a wound chip transformer having the same 1 st and 2 nd wires, for example.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a coil component capable of solving the above problems.

A coil component according to the present invention includes: a core including a core portion having a1 st end portion and a2 nd end portion on one side and the other side, respectively; and a1 st wire and a2 nd wire wound in a spiral shape with substantially the same number of turns from a1 st end toward a2 nd end on the winding core. Here, the 1 st wire is wound in a state of constituting a1 st layer in contact with the circumferential surface of the winding core portion, and the 2 nd wire is wound in a state of constituting a2 nd layer outside the 1 st layer with a majority of the 2 nd wire in a cross section partially fitted into a recess formed between adjacent turns of the 1 st wire.

The reason why the 2 nd layer constituting the outer side of the 1 st layer is wound is that most of the 2 nd wire may be wound in such a manner that a small part of the 2 nd wire is in contact with the circumferential surface of the winding core due to the wound state.

In order to solve the above technical problem, the present invention is characterized by having the following configuration.

That is, when the number of turns n (n is a natural number) from the 1 st end portion side is expressed by the 1 st wire and the 2 nd wire, respectively, there are distributed along the axial direction of the winding core portion:

(1) a staggered 0.5 turn region where 0.5 turns are staggered between the 1 st wire and the 2 nd wire by embedding the nth turn or the (n + 1) th turn of the 2 nd wire into a recess between the nth turn and the (n + 1) th turn of the 1 st wire; and

(2) in the staggered 0.5 turn region, when the nth turn of the 2 nd wire is embedded in the recess between the nth turn and the n +1 th turn of the 1 st wire, the staggered 1.5 turn region of 1.5 turns is staggered between the 1 st wire and the 2 nd wire by embedding the n +2 th turn of the 2 nd wire in the recess between the nth turn and the n +1 th turn of the 1 st wire, or in the staggered 0.5 turn region, when the n +1 th turn of the 2 nd wire is embedded in the recess between the nth turn and the n +1 th turn of the 1 st wire, the staggered 1.5 turn region of 1.5 turns is staggered between the 1 st wire and the 2 nd wire by embedding the n-1 st turn of the 2 nd wire in the recess between the nth turn and the n +1 th turn of the 1 st wire.

Further, the sum of the number of turns of the 2 nd wire in the 0.5 turn shift region is 2 times or more and 5 times or less the sum of the number of turns of the 2 nd wire in the 1.5 turn shift region.

With this configuration, as will be apparent from the examination described later, the diagonal capacitances generated between the 1 st line and the 2 nd line can be balanced in the entire 1 st line and the entire 2 nd line.

According to the present invention, the influence of the stray capacitance generated between the 1 st and 2 nd lines can be reduced. Therefore, for example, in the common mode choke coil, the mode conversion characteristic can be reduced.

Drawings

Fig. 1 is a bottom view of a common mode choke coil 61 as a coil component according to embodiment 1 of the present invention, showing a surface facing a mounting substrate side.

Fig. 2 is a cross-sectional view schematically showing a winding state of the 1 st wire 43 and the 2 nd wire 44 in the common mode choke coil 61 shown in fig. 1.

Fig. 3 is a sectional view for explaining a winding sequence of the 1 st line 43 shown in fig. 2.

Fig. 4 is a sectional view for explaining a winding sequence of the 2 nd line 44 shown in fig. 2.

Fig. 5 is a cross-sectional view for explaining a slant capacitance (slant capacitance) generated between the 1 st line 43 and the 2 nd line 44 shown in fig. 2.

FIG. 6 is an equivalent circuit diagram for explaining the skew capacitance generated between the 1 st line 43 and the 2 nd line 44 shown in FIG. 5 in more detail

Fig. 7 is a view corresponding to the upper half of fig. 2, and is a cross-sectional view schematically showing a winding state of the 1 st wire 43 and the 2 nd wire 44 in the common mode choke coil 61a according to the 2 nd embodiment of the present invention.

Fig. 8 is a view corresponding to the upper half of fig. 2, and is a cross-sectional view schematically showing the winding state of the 1 st wire 43 and the 2 nd wire 44 in the common mode choke coil 61b according to embodiment 3 of the present invention.

Fig. 9 is a perspective view showing an external appearance of a common mode choke coil 41 having a configuration substantially similar to that described in patent document 1.

Fig. 10 is an equivalent circuit diagram of the common mode choke coil 41 shown in fig. 9.

Fig. 11 is a cross-sectional view for explaining the diagonal capacitance generated between the 1 st line 43 and the 2 nd line 44 shown in fig. 9.

Fig. 12 is an equivalent circuit diagram for explaining the skew capacitance generated between the 1 st line 43 and the 2 nd line 44 shown in fig. 11 in more detail.

Detailed Description

First, regarding the problem of the increase in the mode conversion characteristic (hereinafter, referred to as "Scd 21"), what the inventors of the present application have found is described below.

The reason for the above-described problem is that the stray capacitance (distributed capacitance) generated in association with the common mode choke coil 41 collapses the balance of the signal passing through the common mode choke coil 41.

First, the stray capacitance generated in the common mode choke coil 41 will be described in more detail with reference to fig. 11 and 12. Fig. 11 is an enlarged cross-sectional view showing a part of the winding state of the 1 st and 2

nd wires

43 and 44 around the winding core 45. In fig. 11, numerals marked in the cross-sections of the 1 st line 43 and the 2 nd line 44 indicate the number of turns (turn). That is, in fig. 11, the 1 st to 3 rd turns of the 1 st and 2

nd wires

43 and 44 are shown in an enlarged manner in a sectional view. In fig. 11, in order to clarify the difference between the 1 st line 43 and the 2 nd line 44, the cross section showing the 1 st line 43 is hatched.

As shown in fig. 11, the 1 st wire 43 constituting the 1 st layer and the 2 nd wire 44 constituting the 2 nd layer are wound on the winding core 45 in accordance with a rule that a concave portion between the 1 st turn and the 2 nd turn of the 1 st wire 43 is fitted into the 1 st turn of the 2 nd wire 44 and a concave portion between the 2 nd turn and the 3 rd turn of the 1 st wire 43 is fitted into the 2 nd turn of the 2 nd wire 44.

In the generalized expression, the recess between the nth turn and the (n + 1) th turn of the 1 st wire 43 is fitted into the nth turn of the 2 nd wire 44. As a result, the positions of the 1 st and 2

nd threads

43 and 44 in the axial direction of the winding core 45 are not aligned, and are shifted by 0.5 turns.

The 1 st to 4 th turns of the 1

st wires

43 and 44, respectively, are illustrated in fig. 12. In fig. 12, 1 turn of each of the 1

st wires

43 and 44 is represented by one inductor symbol, and the same turns of each of the 1

st wires

43 and 44 are shown arranged in the upper and lower rows.

In such a wound state, a stray capacitance (distributed capacitance) is generated between the 1 st wire 43 and the 2 nd wire 44. Since the size of the stray capacitance is proportional to the physical distance between the

lines

43 and 44, the influence of the stray capacitance generated between the

adjacent lines

43 and 44 is dominant on the characteristics of the common mode choke coil 41. Specific examples of the stray capacitance generated between the

adjacent wires

43 and 44 include a stray capacitance generated between the 1 st turn of the 1 st wire 43 and the 1 st turn of the 2 nd wire 44 in fig. 11, a stray capacitance generated between the 2 nd turn of the 1 st wire 43 and the 1 st turn of the 2 nd wire 44, and the like.

Here, the present inventors have found that the factor of increasing Scd21 is that, of the stray capacitances generated between

adjacent lines

43 and 44, the influence of a stray capacitance Cd between different turns of the 1 st line 43 and the 2 nd line 44 (hereinafter referred to as "skew capacitance Cd") is large. Therefore, only the ramp capacitance Cd is illustrated in fig. 11 and 12.

The diagonal capacitance Cd in the common mode choke coil 41 is formed between the (n + 1) th turn of the 1 st wire 43 and the n-th turn of the 2 nd wire as between the 2 nd turn of the 1 st wire 43 and the 1 st turn of the 2 nd wire, for example. Therefore, in the equivalent circuit diagram of fig. 12 in which the same turns of the 1 st wire 43 and the 2 nd wire 44 are arranged in the upper and lower rows, the diagonal capacitance Cd is in a so-called "right diagonal down" connection posture. Note that the expression "obliquely downward right" or "obliquely upward right" is also used in the following description.

Next, the influence of the "diagonally downward right" connection posture on Scd21 will be described. First, in fig. 10, the ratio of the signal input from the 1 st terminal electrode 48 to the 3 rd terminal electrode 50 is S21, and the ratio of the signal input from the 1 st terminal electrode 48 to the 4 th terminal electrode 51 is S41. Similarly, the ratio of the signal input from the 2 nd terminal electrode 49 to the 3 rd terminal electrode 50 is S23, and the ratio of the signal input from the 2 nd terminal electrode 49 to the 4 th terminal electrode 51 is S43.

In this case, Scd21 represents S21+ S41-S23-S43, and when the formula is modified, Scd21 represents (S21-S43) + (S41-S23). Here, S41 and S23 relate to the characteristics of the signal propagating between the 1 st line 43 and the 2 nd line 43, and are greatly affected by the signal transmitted through the stray capacitance generated between the 1 st line 43 and the 2 nd line 43 in particular.

At this time, in the common mode choke coil 41, due to the presence of the aforementioned slant capacitance Cd, the propagation paths of some signals are different between S41 and S23. For example, S41 is the value of the signal delivered on a path including a sloped capacitance Cd with a slope of-1 (e.g., a path from turn 2 of line 1 43 to turn 1 of line 2 44, etc.). As it travels from the 1 st wire 43 to the 2 nd wire 44, the signal is transmitted in a manner that returns exactly (reverts back) for the amount of-1 turn. On the other hand, S23 is a value of a signal transferred in a path including the slope capacitance Cd having a slope of +1 (e.g., a path from the 2 nd turn of the 2 nd wire 44 to the 3 rd turn of the 1 st wire 43, etc.). While traveling from the 2 nd wire 44 to the 1 st wire 43, the signal travels in a manner that just advances (shortcuts) +1 turn. Therefore, among the above 2 signals, since the attenuation characteristics of the signals are different due to the difference in the distances passed through the inductors, the asymmetry between S41 and S23 is generated, (S41 to S23) is not 0.

In addition, in S41 and S23, a signal transmitted through a path including stray capacitance (the slope is 0) generated between the same turns of the 1 st line 43 and the 2 nd line 44 is included, but S41 and S23 are symmetrical with respect to the path, and the influence on the terms (S41 to S23) can be almost ignored.

Thus, asymmetry of the signal propagation characteristics due to the difference in the slope of the slope capacitance Cd occurs between S41 and S23. In the common mode choke coil 41, the S41 side has a path of the slope capacitance Cd having a slope of-1 over almost all turns, and the S23 side has a path of the slope capacitance Cd having a slope of +1 over almost all turns. That is, the asymmetry of the signal propagation characteristics between S41 and S23 becomes further large due to the sum of the signals passing through these paths, and the term of (S41-S23) has an effective value, so the Scd21 becomes large.

In addition to the above-described stray capacitance generated between the

lines

43 and 44, stray capacitance generated between the

lines

43 and 44 and the terminal electrodes 48 to 51, stray capacitance generated between the wiring on the mounting substrate and the reference ground surface in a state where the common mode choke coil 41 is mounted, and the like exist as the stray capacitance, and it is considered that the influence of the sum of the slopes of the stray capacitance generated between the

lines

43 and 44, particularly the slope capacitance Cd, is the largest.

The present inventors have focused on the sum of the slopes of the slope capacitances Cd affected by the above-described S41 and S23, and have conceived of the embodiments described below.

Next, an embodiment of the present invention will be described with respect to a common mode choke coil.

Fig. 1 shows a common mode choke coil 61 according to embodiment 1 of the present invention. The common mode choke coil 61 shown in fig. 1 is different from the common mode choke coil 41 shown in fig. 9 only in the winding form of the 1 st wire 43 and the 2 nd wire 44, and the configuration is substantially the same except for this. Therefore, in fig. 1, elements corresponding to those shown in fig. 9 are given the same reference numerals, and redundant description is omitted.

Fig. 1 shows a surface of the common mode choke coil 61 facing the mounting substrate. In fig. 1, the top plate 54 shown in fig. 9 is not shown. In fig. 1, in order to clearly distinguish the 1 st line 43 from the 2 nd line 44, the 1 st line 43 is shown in black and the 2 nd line 44 is shown in blank.

Fig. 2 shows a schematic cross-sectional view of a winding state of the 1 st wire 43 and the 2 nd wire 44 in the common mode choke coil 61 shown in fig. 1. Comparing fig. 1 with fig. 2, it can be seen that the number of turns of the

wires

43 and 44 is smaller in fig. 1 than in fig. 2, and the

wires

43 and 44 are not shown in fig. 1. In fig. 2 and the following drawings, a cross section showing the 1 st line 43 is hatched to clarify the distinction from the 2 nd line 44.

The 1 st wire 43 and the 2 nd wire 44 are wound in a spiral shape on the winding core 45 from the 1 st end 62 side where the 1 st flange portion 46 is provided toward the 2 nd end 63 side where the 2 nd flange portion 47 is provided, with substantially the same number of turns. In the cross section of each of the 1 st wire 43 and the 2 nd wire 44 shown in fig. 2, the number of turns "1" to "32" counted from the 1 st end portion 62 side of the winding core portion 45 is marked. The number of turns is indicated in the cross section of each of the 1 st line 43 and the 2 nd line 44, and is also used in fig. 3 and 4 and fig. 7 and 8 described later.

The 1 st wire 43 is wound in a state of constituting the 1 st layer in contact with the circumferential surface of the winding core 45, and the 2 nd wire 44 is wound in a state of constituting the 2 nd layer outside the 1 st layer with a part of the cross section thereof fitted into a recess formed between adjacent turns of the 1 st wire.

The details of the winding state of the 1 st wire 43 and the 2 nd wire 44 will be described with reference to fig. 3 and 4 together with fig. 2. In fig. 3 and 4, of the respective portions of the 1 st wire 43 and the 2 nd wire 44 wound around the winding core 45, the portion located on the front side of the winding core 45 is schematically shown by a solid line, and the portion blocked by the winding core 45 is schematically shown by a broken line. Note that not all of the portions of the

wires

43 and 44 that are blocked by the winding core 45 are shown, and only characteristic positions are shown by broken lines.

In fig. 2 to 4, the "0.5-turn region a", "transition region C", and "1.5-turn region B" are shown in this order from the 1 st end 62 to the 2 nd end 63 of the winding core 45. That is, along the axial direction of the winding core 45, the offset 0.5 turn region a, the transition region C, and the offset 1.5 turn region B are distributed. The reason for the names of the respective regions a to C will become clear from the description below, and the description of the winding state of the 1 st wire 43 and the 2 nd wire 44 is performed separately for each of the regions a to C.

First, the 1 st wire 43 is connected at its leading end to the 1 st terminal electrode 48 (see fig. 1).

Next, referring mainly to fig. 3, the 1 st wire 43 is wound from the 1 st turn to the 24 th turn in the 0.5 turn offset region a without forming a gap between adjacent turns.

Next, in the transition region C, the portion located in the 1 st wire 43, which is shifted from the 24 th turn to the 25 th turn, forms a gap between the 24 th turn and the 25 th turn.

Next, in the region B with 1.5 turns offset, the 1 st wire 43 is wound from the 25 th turn to the 32 th turn again without forming a slit between adjacent turns.

The 1 st wire 43 is connected at its end to the 3 rd terminal electrode 50 (see fig. 1). Then, the 2 nd wire 44 is wound.

First, the start end of the 2 nd wire 44 is connected to the 2 nd terminal electrode 49 (see fig. 1).

Next, referring mainly to fig. 4, in the 0.5 turn shift region a, the 1 st turn to the 23 rd turn of the 2 nd wire 44 is wound from the 1 st turn of the 2 nd wire 44 in a state where, for example, a recess between the 1 st turn and the 2 nd turn of the 1 st wire 43 is fitted into the 1 st turn of the 2 nd wire 44, that is, in a generalized state, a recess between the nth turn and the (n + 1) th turn of the 1 st wire 43 is fitted into the nth turn of the 2 nd wire 44.

Next, in the transition region C, the 2 nd wire 44 is wound with the 24 th turn in a state where a slit is formed with respect to the 23 rd turn, and the 25 th turn is wound with a slit formed with respect to the 24 th turn. These 24 th turn and 25 th turn are wound in contact with the peripheral surface of the winding core 45. In this case, as can be seen from a comparison of fig. 3 and 4, the 2 nd line 44 intersects the 1 st line 43 at 3 positions.

Next, in the region B with 1.5 turns shifted, first, the 26 th turn of the 2 nd wire 44 is fitted into a concave portion between the 25 th turn thereof and the 25 th turn of the 1 st wire 43, and then, the 2 nd turn of the 2 nd wire 44 is wound from the 26 th turn to the 32 th turn of the 2 nd wire 44 in a state where the 27 th turn of the 2 nd wire 44 is fitted into a concave portion between, for example, the 25 th turn and the 26 th turn of the 1 st wire 43, that is, the n +2 th turn of the 2 nd wire 44 is fitted into a concave portion between the n th turn and the n +1 th turn of the 1 st wire 43 in a generalized manner.

The terminal of the 2 nd wire 44 is connected to the 4 th terminal electrode 51 (see fig. 1).

In fig. 2 and 4, a circle indicated by a broken line adjacent to the 2 nd line 44 is used to clearly show a portion not wound here, that is, to form a "void".

The oblique capacitance generated in the common mode choke coil 61 configured as described above will be described with reference to fig. 5 and 6. Fig. 5 is an enlarged cross-sectional view showing a part of the winding state of the 1 st and 2

nd wires

43 and 44 around the winding core 45. In fig. 5, numerals marked in or near the cross section of each of the 1 st line 43 and the 2 nd line 44 indicate the number of turns. That is, fig. 5 shows the 1 st to 3 rd turns of the 1 st and 2

nd wires

43 and 44, the 25 th to 27 th turns of the 1 st wire 43, and the 26 th to 28 th turns of the 2 nd wire 44, respectively.

As shown in fig. 5, in the 0.5 turn offset region a, the 1 st wire 43 and the 2 nd wire 44 are offset from each other by 0.5 turns. Therefore, the name "staggered 0.5 turn region" is given. On the other hand, in the region B with a 1.5 turn shift, the 1 st wire 43 and the 2 nd wire 44 are shifted from each other by 1.5 turns. Therefore, the name "staggered 1.5 turn region" is given. "transition region" means a region that shifts from region a offset by 0.5 turns to region B offset by 1.5 turns.

Fig. 6 shows the same turns of the 1 st wire 43 and the 2 nd wire 44 arranged in the upper and lower rows by the same method as in fig. 12, and shows the stray capacitances (diagonal capacitances) generated between the different turns of the 1 st wire 43 and the 2 nd wire 44 shown in fig. 5 by an equivalent circuit diagram.

In the 0.5-turn shift region a, the arrangement of the 1 st wire 43 and the 2 nd wire 44 is the same as that shown in fig. 11 described above, and an equivalent circuit similar to that shown in fig. 12 is formed. Therefore, in the offset 0.5 turn region a shown in fig. 5, a so-called "right ramp down" ramp capacitance Cd as shown in the offset 0.5 turn region a of fig. 6 is formed between the 1 st wire 43 and the 2 nd wire 44. In particular, when viewed from the 2 nd line 44 side, the slope of the diagonal capacitance Cd in the 0.5 turn region a is "+ 1".

On the other hand, as shown in fig. 5, in the 1.5-turn shift region B, the diagonal capacitances Cd1 and Cd2 are formed between the 1 st line 43 and the 2 nd line 44. As shown by the region shifted by 1.5 turns in fig. 6, in the equivalent circuit diagram, the diagonal capacitors Cd1 and Cd2 are connected in a so-called "right-diagonal up" connection posture. In particular, when viewed from the 2 nd line 44 side, the slope of the diagonal capacitance Cd1 in the offset 1.5 turn region B is "-1", and the slope of the diagonal capacitance Cd2 is "-2".

Here, the ramp capacitance Cd and each of the ramp capacitances Cd1 and Cd2 are digitized, and the magnitude and the action of each are examined.

For example, when the connection posture is "diagonally right down" like the diagonal capacitance Cd shown in the 0.5 turn region a in fig. 6, the diagonal capacitance is given a sign of "+" when the value is expressed as a numerical value. Conversely, for example, when the skew capacitance Cd1 or Cd2 has a connection posture of "right-oblique top" as in the skew capacitance Cd1 or Cd2 shown in the 1.5-turn region B in fig. 6, a sign of "+" is given when the skew capacitance is expressed as a numerical value.

In addition, when the difference between the number of turns on the 1 st line 43 side and the number of turns on the 2 nd line 44 side, which causes the skew capacitance, is "1" as in the skew capacitance Cd shown in the 0.5-turn shift area a of fig. 6 or the skew capacitance Cd1 shown in the 1.5-turn shift area B of fig. 6, the absolute value of the skew capacitance is numerically set to "1". In addition, as in the case of the ramp capacitor Cd2 shown in the region B with 1.5 turns in fig. 6, when the difference between the number of turns on the 1 st wire 43 side and the number of turns on the 2 nd wire 44 side, which causes the ramp capacitor, is "2", the absolute value of the ramp capacitor is set to "2".

According to the above rule, the diagonal capacitance Cd generated in the 0.5-turn shift region a of fig. 5 can be numerically "+ 1". That is, in the offset 0.5 turn region a, every 1 turn of the 2 nd wire 44 generates a diagonal capacitance of "+ 1". In addition, the ramp capacitance Cd1 generated in the offset 1.5 turn region B of FIG. 5 can be numerically-controlled to "-1", and the ramp capacitance Cd2 generated in the same offset 1.5 turn region B of FIG. 5 can be numerically-controlled to "-2". Thus, in the staggered 1.5 turn region B, every 1 turn of the 2 nd wire 44 produces a diagonal capacitance of (-1) + (-2) ═ 3.

Here, the sum of the number of turns of the 2 nd wire 44 positioned in the 0.5 turn shift region A is N_0.5And N is the sum of the number of turns of the 2 nd wire 44 positioned in the region B with 1.5 turns offset_1.5In the 0.5 turn offset region A, the total of +1 XN is generated_0.5The diagonal capacitance of (A) generates-3 XN as a whole in the region B staggered by 1.5 turns_1.5The skew capacitance of (2).

Therefore, if the sum N of the number of turns of the 2 nd wire 44 located in the 0.5 turn region A is shifted_0.5Is the sum N of the number of turns of the 2 nd wire 44 located in the region B staggered by 1.5 turns _1.53 times of that, i.e. N_0.5＝N_1.5X 3, then +1 XN is generated in the 0.5 turn region A as a whole_0.5＝+1×N_1.5×3＝+3×N_1.5And-3 XN of the whole of the region B staggered by 1.5 turns_1.5The oblique capacitances of (1) th line 43 and (2) th line 44 are cancelled out, and the oblique capacitances generated between the 1 st line 43 and the 2 nd line 44 can be balanced over the entire 1 st line 43 and the 2 nd line 44. Therefore, the influence of the skew capacitance generated between the 1 st line 43 and the 2 nd line 44 can be reduced, and the mode conversion characteristic of the common mode choke coil 61 can be reduced.

In addition to the above-described stray capacitance generated between the

wires

43 and 44, stray capacitances generated between the

wires

43 and 44 and the terminal electrodes 48 to 51, stray capacitances generated between wirings on the mounting substrate and the reference ground surface in a state where the common mode choke coil 41 is mounted, and the like are actually present as stray capacitances having an influence on the mode conversion characteristics. Therefore, considering these stray capacitances and the like, and further considering that there may also be a case where the number of turns of the 2 nd wire 44 is not divided into 1: 3 is not limited to the sum N of the number of turns of the 2 nd wire 44 located in the 0.5 turn shift region A_0.5Is exactly atSum N of turns of 2 nd wire 44 staggered by 1.5 turn region B_1.5The range of the present invention is 3 times, 2 times or more and 5 times or less.

When the specific winding state shown in fig. 2 is described, in the region a shifted by 0.5 turns, the sum N of the number of turns of the 2 nd wire 44_0.5Is "23", and in the region B staggered by 1.5 turns, the sum N of the turns of the 2 nd wire 44_1.5Is "6". Thus, the sum N of the turns of the 2 nd wire 44_0.5Is the sum N of the number of turns of the 2 nd wire 44_1.523/6 ≈ 3.8 times.

As described above, with respect to N_0.5/N_1.5The value of (b) is in the range of 2 times or more and 5 times or less in the present invention. In the case of the winding method shown in fig. 2, the total number of turns in the 0.5 turn shift region a and the 1.5 turn shift region B, that is, N, of the 2 nd wire 44 forming the 2 nd layer in a state of being mounted on the 1 st wire 43 forming the 1 st layer_0.5+N_1.5Is 29. Will be N_0.5+N_1.5The number of the devices is 2 when the device is divided into 29,

in N_0.5Is 20, N_1.5In the case of 9, N_0.5/N_1.5And is about 2.2 of the total weight of the alloy,

in N_0.5Is 21, N_1.5In the case of 8, N_0.5/N_1.5And is about 2.6 of the total weight of the alloy,

in N_0.5Is 22, N_1.5In the case of 7, N_0.5/N_1.5And is about 3.1 of the total weight of the alloy,

in N_0.5Is 23, N_1.5In the case of 6, N_0.5/N_1.5And is about 3.8 of the total weight of the alloy,

in N_0.5Is 24, N_1.5In the case of 5, N_0.5/N_1.5Is 4.8.

Therefore, in any of the above cases, N_0.5/N_1.5The value of (b) is within the range of 2 times or more and 5 times or less, and can be said to be within the range of the present invention.

Next, a common mode choke coil 61a according to embodiment 2 of the present invention will be described with reference to fig. 7. Fig. 7 shows a winding state of the 1 st wire 43 and the 2 nd wire 44 in the common mode choke coil 61 a. Fig. 7 is a view corresponding to the upper half of fig. 2. Therefore, in fig. 7, the same reference numerals are given to elements corresponding to those shown in fig. 2, and redundant description is omitted.

In the common mode choke coil 61a shown in fig. 7, in the axial direction of the winding core 45, the common mode choke coil is distributed in the order of a 1.5 turn region B, a transition region C, and a 0.5 turn region a from the 1 st end 62 toward the 2 nd end 63, contrary to the case of the common mode choke coil 61 shown in fig. 2.

The 1 st wire 43 extends over the offset 1.5 turn region B, the transition region C, and the offset 0.5 turn region a, and is wound from the 1 st turn to the 32 nd turn without forming a gap between adjacent turns.

The 2 nd wire 44 is wound from the 1 st turn to the 8 th turn in the region B staggered by 1.5 turns. First, the 1 st turn of the 2 nd wire 44 is wound in contact with the circumferential surface of the winding core 45 and in contact with the 1 st turn of the 1 st wire, and the 2 nd turn is wound to be fitted into a recess between the 1 st turn of the 1 st wire 43 and the 1 st turn of the 1 st wire. Thereafter, the 3 rd turn of the 2 nd wire 44 is wound so as to fit into a concave portion between the 1 st turn and the 2 nd turn of the 1 st wire 43, that is, the n +2 th turn of the 2 nd wire 44 is fit into a concave portion between the n th turn and the n +1 th turn of the 1 st wire 43 in a normal case.

Next, in the transition region C, the 2 nd wire 44 is located at a portion shifted from the 8 th turn to the 9 th turn. A gap is formed between the 8 th and 9 th turns as indicated by the dashed circle forming an "empty" portion that is not wrapped. At this time, although not shown, the 2 nd line 44 intersects the 1 st line 43 at 3 positions.

Next, in the 0.5 turn shift region a, the 9 th turn of the 2 nd wire 44 is wound from the 9 th turn to the 31 th turn of the 2 nd wire 44 in a state where the 9 th turn of the 2 nd wire 44 is fitted into, for example, a recess between the 9 th turn and the 10 th turn of the 1 st wire 43, that is, the n-th turn of the 2 nd wire 44 is fitted into a recess between the n-th turn and the n +1 th turn of the 1 st wire 43 in a normal state. Finally, the 2 nd turn of the 2 nd wire 44 is wound in contact with the peripheral surface of the winding core 45 and in contact with the 32 nd turn of the 1 st wire.

In the specific winding state shown in fig. 7 as described above, in the region B shifted by 1.5 turns, the sum N of the number of turns of the 2 nd wire 44_1.5Is "6" inIn the 0.5 turn region A, the sum N of the number of turns of the 2 nd wire 44_0.5Is "23". Thus, the sum N of the turns of the 2 nd wire 44_0.5Is the sum N of the number of turns of the 2 nd wire 44_1.523/6 ≈ 3.8 times.

Next, a common mode choke coil 61b according to embodiment 3 of the present invention will be described with reference to fig. 8. Fig. 8 shows the winding state of the 1 st wire 43 and the 2 nd wire 44 of the common mode choke coil 61b, as in the case of fig. 7. Fig. 8 is a view corresponding to the upper half of fig. 2. Therefore, in fig. 8, the same reference numerals are given to elements corresponding to those shown in fig. 2, and redundant description is omitted.

In the common mode choke coil 61B shown in fig. 8, the 1 st offset 0.5 turn region a1, the 1 st transition region C1, the 1.5 turn region B, the 2 nd transition region C2, and the 2 nd offset 0.5 turn region a2 are distributed from the 1 st end 62 toward the 2 nd end 63 in the order of the 1 st offset 0.5 turn region a1, the 1 st transition region C1, the 1.5 turn region B, the 2 nd transition region C2, and the 2 nd offset 0.5 turn region a2 along the axial direction of the winding core 45.

The 1 st wire 43 is wound from the 1 st turn to the 16 th turn in a state where no slit is formed between adjacent turns in the 1 st offset 0.5 turn region a 1.

Next, in the 1 st transition region C1, the portion located in the 1 st wire 43, which is shifted from the 16 th turn to the 17 th turn, forms a gap between the 16 th turn and the 17 th turn.

Next, the 1 st wire 43 is wound again from the 17 th turn to the 32 nd turn over the 1.5 th turn region B, the 2 nd transition region C2, and the 2 nd 0.5 th turn region a2 without forming a slit between adjacent turns.

On the other hand, in the 1 st shift 0.5 turn region a1, the 2 nd wire 44 is wound from the 1 st turn to the 15 th turn of the 2 nd wire 44 in a state where the 1 st turn of the 2 nd wire 44 is fitted into, for example, a recess between the 1 st turn and the 2 nd turn of the 1 st wire 43, that is, the n-th turn of the 2 nd wire 44 is fitted into a recess between the n-th turn and the n +1 th turn of the 1 st wire 43 in a normal state.

Next, in the 1 st transition region C1, the 2 nd wire 44 is wound with the 16 th turn in a state where a slit is formed with respect to the 15 th turn, and the 17 th turn is wound with the slit formed with respect to the 16 th turn. These 16 th turn and 17 th turn are wound in contact with the peripheral surface of the winding core 45. At this time, although not shown, the 2 nd line 44 intersects the 1 st line 43 at 3 positions.

Next, in the 1.5-turn shift region B, first, the 18 th turn of the 2 nd wire 44 is wound in a state of being fitted into the concave portion between the 17 th turn thereof and the 17 th turn of the 1 st wire 43. Next, the 2 nd turn of the 2 nd wire 44 is wound from the 18 th turn to the 24 th turn of the 2 nd wire 44 in a state where the 19 th turn of the 2 nd wire 44 is fitted into, for example, a recess between the 17 th turn and the 18 th turn of the 1 st wire 43, that is, the n +2 th turn of the 2 nd wire 44 is fitted into a recess between the n th turn and the n +1 th turn of the 1 st wire 43 in a normal state.

Next, in the 2 nd transition region C2, the portion where the 2 nd wire 44 transits from the 24 th turn to the 25 th turn is located. A gap is formed between the 24 th turn and the 25 th turn as indicated by the dashed circle forming an "empty" portion that is not wound. At this time, although not shown, the 2 nd line 44 intersects the 1 st line 43 at 3 positions.

Next, in the 2 nd shift 0.5 turn region a2, the 25 th turn of the 2 nd wire 44 is wound from the 25 th turn to the 31 st turn of the 2 nd wire 44 in a state where the 25 th turn of the 2 nd wire 44 is fitted into, for example, a concave portion between the 25 th turn and the 26 th turn of the 1 st wire 43, that is, the n-th turn of the 2 nd wire 44 is fitted into a concave portion between the n-th turn and the n +1 th turn of the 1 st wire 43 in a normalized state. Finally, the 32 nd turn of the 2 nd wire 44 is wound in contact with the peripheral surface of the winding core 45 and in contact with the 32 nd turn of the 1 st wire.

In the specific winding state shown in fig. 8, the sum N of the total number of turns of the 2 nd wire 44 in the 2 shift 0.5 turn regions a1 and a2 is set to be N_0.5Is "22", and in the region B of 1.5 turns, the sum N of the number of turns of the 2 nd wire 44_1.5Is "6". Thus, the sum N of the turns of the 2 nd wire 44_0.5Is the sum N of the number of turns of the 2 nd wire 44_1.522/6 ≈ 3.7 times.

As a modification of the embodiment shown in fig. 8, the 0.5-turn regions a1 and a2 divided into 2 positions may be further divided into 3 or more positions, or the 1.5-turn regions B may be divided into a plurality of positions. That is, in the embodiment shown in fig. 8, at least one of the 0.5-turn shift region and the 1.5-turn shift region is clearly shown to be distributed in a plurality of positions.

In the common mode choke coils 61, 61a, and 61b described above with reference to the drawings, in the 0.5 turn region A, A1 and the a2, the n-th turn of the 2 nd wire 44 is fitted into the recess between the n-th turn and the n +1 th turn of the 1 st wire 43, and thereby a 0.5 turn amount of offset occurs between the 1 st wire 43 and the 2 nd wire 44. At this time, as can be seen from the common mode choke coils 61, 61a, and 61B, in the 1.5 turn shift region B, the n +2 turn of the 2 nd wire 44 is fitted into the recess between the n turn and the n +1 turn of the 1 st wire 43, and a 1.5 turn shift is generated between the 1 st wire 43 and the 2 nd wire 44.

However, the embodiment of the present invention is not limited to the above, and in the region of the offset of 0.5 turn, the n +1 turn of the 2 nd wire may be fitted into the recess between the n turn and the n +1 turn of the 1 st wire, thereby generating a shift of 0.5 turn between the 1 st wire 43 and the 2 nd wire 44. In this case, in the region of the 1.5 turn shift, the 1 st turn and the 2 nd turn are shifted by 1.5 turns by fitting the n-1 st turn of the 2 nd wire into the recess between the n-th turn and the n +1 th turn of the 1 st wire 43.

However, the above-described configuration is a configuration in which only the direction of the number of turns is reversed (for example, counted from the 2 nd end 63 side) in the configuration provided in the illustrated embodiment, and can be said to be substantially the same configuration. Therefore, illustration is omitted.

Although the present invention has been described in connection with the illustrated embodiment of the common mode choke coil, the present invention can be applied to a wire-wound (wire-wound) chip transformer. It should be noted that the illustrated embodiments are merely examples, and that partial replacement or combination of the configurations may be performed between different embodiments.

Description of reference numerals

41. 61, 61a, 61b … common mode choke coil; 42 … core; 43 … line 1; 44 … line 2; 45 … roll core; 46 … No. 1 flange portion; 47 … 2 nd flange portion; 48 to 51 … terminal electrodes; 62 … end No. 1; 63 nd 63 … nd end 2; A. the A1 and the A2 … are staggered by 0.5 turn regions; b … staggered by 1.5 turn area; cd. Cd1, Cd2 … ramp capacitance (stray capacitance).

Claims

1. A coil component, comprising:

a core including a core portion having a first end portion and a second end portion on one side and the other side, respectively, and

a first wire and a second wire wound in a spiral shape with substantially the same number of turns from the first end portion toward the second end portion on the winding core portion,

the first wire is wound in a state of constituting a first layer in contact with the circumferential surface of the winding core,

the second wire is wound in a state where a part of the second wire in cross section is fitted into a recess formed between adjacent turns of the first wire and constitutes a second layer outside the first layer,

the first wire and the second wire have a transition region, and a first region and a second region, the first wire is wound in a state where no slit is formed between adjacent turns in the first region and the second region, the second wire is wound in a state where the second wire is fitted into a recess formed between adjacent turns of the first wire, the transition region is located between the first region and the second region, and the second wire is wound in a state where a slit is formed between the second wire and an adjacent turn in the transition region,

the transition region is a region shifted by 0.5 turns in which the first and second wires are shifted by 0.5 turns from each other, and a region shifted by 1.5 turns in which the first and second wires are shifted by 1.5 turns from each other,

the sum of the number of turns of the second wire in the 0.5 turn offset region is 2 times or more and 5 times or less the sum of the number of turns of the second wire in the 1.5 turn offset region.

2. The coil component of claim 1,

when the number of turns n counted from the first end side is expressed by the first wire and the second wire,

in the transition region, a gap is formed between the nth turn and the (n + 1) th turn of the first wire, the nth turn is wound in a state where a gap is formed with respect to the (n-1) th turn of the second wire, and the (n + 1) th turn is wound in a state where a gap is formed with respect to the nth turn,

wherein n is a natural number.

3. The coil component of claim 1 or 2, wherein,

in the transition region, the second line crosses the first line at three positions.

4. A coil component, comprising:

a core including a core portion having a first end portion and a second end portion on one side and the other side, respectively; and

the first wire and the second wire have a transition region, and a first region and a second region, the first wire is wound in a state where no slit is formed between adjacent turns in the first region and the second region, the second wire is wound in a state where the second wire is fitted into a recess formed between adjacent turns of the first wire, the transition region is located between the first region and the second region, the first wire is wound in a state where no slit is formed between the first wire and the adjacent turns in the transition region, and a slit is formed between adjacent turns of the second wire,

5. The coil component of claim 4, wherein,

6. A coil component, comprising:

the first wire and the second wire have a first transition region, a second transition region, and a first region and a second region, the first wire is wound in a state where no slit is formed between adjacent turns in the first region and the second region, the second wire is wound in a state where the second wire is fitted into a recess formed between adjacent turns of the first wire, the first transition region is located between the first region and the second region, the second wire is wound in a state where a slit is formed between the second wire and an adjacent turn in the first transition region, the first wire is wound in a state where a slit is not formed between the first wire and an adjacent turn in the second transition region, and a slit is formed between adjacent turns of the second wire,

the first transition region and the second transition region are shifted from each other by a 0.5-turn region where the first wire and the second wire are shifted from each other by 0.5 turns, and by a 1.5-turn region where the first wire and the second wire are shifted from each other by 1.5 turns,

7. The coil component of claim 6,

in the first transition region, a slit is formed between the nth turn and the (n + 1) th turn of the first wire, the nth turn is wound in a state in which a slit is formed with respect to the (n-1) th turn of the second wire, and the (n + 1) th turn is wound in a state in which a slit is formed with respect to the nth turn,

wherein n is a natural number.

8. The coil component of claim 6 or 7, wherein,

in the first transition region and the second transition region, the second line crosses the first line at three positions.